Mark what you describe, to me that is, is someone being zealous to over-zealous in their practice. Thus, pain resulting from that action, and not a result from a painless technique and what is or isn't learned from that.

From that as well, and being a different topic, we learn from such painful experiences and people as well. I would learn and understand the greater scope and dynamic of a nikkyo etc. As well as how to defend and protect myself from the technique. Just as example.

But to keep on track, painless techniques is there something to learn from them or not. Which also is inferred to be the same for painful techniques.